This parameter defines the PSD mask that is assumed to be permitted at the exchange. This parameter shall use the same format as PSDMASKds. The maximum number of breakpoints for DPBOEPSD is 16. This is a string of 16 pairs of values in the following structure: Octets 0+1 - Index of 1st sub-carrier used in the context of a first breakpoint. Octet 2 - The PSD reduction for the sub-carrier indicated in octets 0 and 1. Octets 3-5 - Same, for a 2nd breakpoint. Octets 6-8 - Same, for a 3rd breakpoint. This architecture continues until octets 45-47, which are associated with a 16th breakpoint. Each subcarrier index is an unsigned number in the range 1 and NSCds. Each PSD reduction value is in the range 0 (0dBm/Hz) to 255 (-127.5dBm/Hz) with steps of 0.5dBm/Hz. Valid values are in the range 0 to 190 (0 to -95dBm/Hz). When the number of breakpoints is less than 16, all remaining octets are set to the value 0xff.